mu is a tool for dealing with e-mail messages stored in the Maildir-format. mu’s purpose in life is to help you to quickly find the messages you need; in addition, it allows you to view messages, extract attachments, create new maildirs, and so on.
Built on top of mu are some extensions, including mu4e, which is a full-featured e-mail client that runs inside Emacs. mu4e is designed to enable super-efficient handling of e-mail; searching, reading, replying, moving, and deleting.
mu4e keeps all the ‘state’ in your maildirs, so you can easily switch between clients, synchronize over IMAP, backup with rsync and so on.
Key Features
- Fully search-based: even if you ‘jump to a folder’, you are executing a query for messages that happen to have the property of being in a certain folder.
- Dynamic folders.
- UI optimized for speed with quick key strokes for common actions.
- Fully documented, with example configurations.
- Asynchronous: heavy actions never block emacs.
- Write rich-text e-mails using /org-mode/ (experimental).
- Address auto-completion based on your messages – no need for managing address books.
- Split view – see the Headers view and the Message view next to each other, with the message selected in the former, visible in the latter.
- Extendable in many places using custom actions. Write your own emacs-lisp to make mu4e behave exactly as you want.
Website: www.djcbsoftware.nl/code/mu/mu4e.html
Support: Manual, GitHub Code Repository
Developer: Dirk-Jan C. Binnema and contributors
License: GNU General Public License v3.0

mu4e is written in C, C++, and Emacs Lisp. Learn C with our recommended free books and free tutorials. Learn C++ with our recommended free books and free tutorials. Learn Lisp with our recommended free books and free tutorials.
Related Software
| Console Email Clients | |
|---|---|
| NeoMutt | Brings together many patches to extend Mutt |
| mu4e | An extension of mu that runs a full-featured email client within Emacs |
| Himalaya | CLI email client written in Rust |
| Sup | Curses threads-with tags style email client |
| Mutt | Small but very powerful text based program |
| Alpine | Alternatively Licensed Program for Internet News and Email |
| meli | Configurable and extensible e-mail client with sane defaults |
| nmail | User interface similar to alpine / pine |
| alot | Lets notmuch handle your mailindex and uses a toolkit to render its display |
| Wanderlust | Mail/news management system with IMAP4rev1 support for Emacs |
| aerc | Billed as a "pretty good email client" |
| Cone | COnsole Newsreader And Emailer |
| matcha | Powerful, feature-rich email client for your terminal |
| bower | Curses frontend for the Notmuch email system |
| Vmail | Vim interface to Gmail |
| neatmail | Non-interactive email client |
Read our verdict in the software roundup.
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